What is anthracnose and is it found in Denver?

Colorado Premier Tree Care have found Anthracnose on ash trees here in Denver

Fungus anthracnose, also known as Colletotrichum, is a type of fungus that affects a wide range of plants, including trees and shrubs. This fungus is particularly prevalent in areas with high humidity and frequent rain, making it a common problem in many urban environments.

Anthracnose primarily attacks the leaves, twigs and branches of a tree, causing them to wilt, die back, and fall off. The fungus causes small, circular, dark brown or black spots to form on the leaves, which can eventually lead to the leaves turning yellow or brown and falling off prematurely.

The fungus can also attack the fruit, flowers, and buds of a tree, causing them to become distorted, discolored, and ultimately, fall off the tree. These symptoms can occur on a wide range of tree species, but some tree species are more susceptible than others such as sycamore, dogwood, ash, and honey locust.

Anthracnose is caused by a group of fungi that thrive in moist environments. The spores of the fungus are spread by water, wind, and insects, and they can infect a tree when the conditions are right. To prevent the spread of the fungus, it is important to remove any infected plant material and to keep the area around the tree clean and free of debris.

The best way to control anthracnose is by using a combination of cultural and chemical control methods. Cultural methods include proper pruning, watering, fertilizing, and maintaining the overall health of the tree, which makes it less susceptible to the fungus. Chemical control methods include using fungicides, which can be applied as a preventative measure or as a treatment for an existing infection.

It is important to note that when using fungicides, it is essential to follow the manufacturer's instructions and to be aware of any potential risks or hazards to the environment and human health. Consult with a certified arborist or a professional pesticide applicator to ensure the proper and safe use of fungicides.

If you have spotted this ailment in your yard I'm sorry because it sucks ! but the best thing you can do as the homeowner is the make sure the leafs are raked up and disposed of to limit this biotic spreading more. good luck ! Cheers Denver !